On moral supervenience
Conventional accounts of moral supervenience are not fit for the moral realist to use against skeptic objections. In particular, they do not provide a sufficiently robust account of dependence or determination needed to counter the argument from queerness. This is shown in their inadequacy to deal with cases of minimal discernibility and cases of moral gradation. A similarity-base account of supervenient seems to be the one that the moral realist ought to incorporate instead.
Alvarado, Ramon, "On moral supervenience" (2014). ETD Collection for University of Texas, El Paso. AAI1557742.